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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Statement of Cash Flows [Abstract] |  |  |
Non-cash loss on extinguishment of debt, net |  | $ 0 | $ 22
Loss on extinguishment of debt |  | 0 | 35
Net cash provided by operating activities |  | 140,135 | 134,979
Net cash provided by investing activities |  | 189,259 | 514,827
Cash paid for extinguishment of debt |  | 0 | (13)
Net cash used in financing activities |  | 0 | (2,517)
Net change in cash, cash equivalents, and restricted cash |  |  | 647,289
Cash, cash equivalents, and restricted cash at beginning of period | [1] | 313,943 | 12,372
Cash, cash equivalents, and restricted cash at end of period | [1] | 643,337 | 659,661
Income Statement [Abstract] |  |  |
Exploration |  | 13,727 | 11,817
General and administrative |  | 27,682 | 28,817
Total operating expenses |  | 310,527 | 206,577
Income from operations |  | 459,068 | 166,161
Other non-operating income (expense), net |  | $ 409 | (233)
As Reported |  |  |
Statement of Cash Flows [Abstract] |  |  |
Non-cash loss on extinguishment of debt, net |  |  | 22
Net cash provided by operating activities |  |  | 134,966
Other, net |  |  | 2,486
Net cash provided by investing activities |  |  | 517,313
Net cash used in financing activities |  |  | (2,504)
Net change in cash and cash equivalents |  |  | 649,775
Cash and cash equivalents at beginning of period |  |  | 9,372
Cash and cash equivalents at end of period |  |  | 659,147
Income Statement [Abstract] |  |  |
Exploration |  |  | 11,978
General and administrative |  |  | 29,224
Total operating expenses |  |  | 207,145
Income from operations |  |  | 165,593
Other non-operating income (expense), net |  |  | $ 335
[1] | Refer to Note 1 - Summary of Significant Accounting Policies for a reconciliation of cash, cash equivalents, and restricted cash reported to the amounts reported within the accompanying condensed consolidated balance sheets (“accompanying balance sheets”).

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 + Details
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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e64954-109465 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(15)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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